It has been pointed out that clarification of the river bed variation characteristics is an important problem in river engineering.
In this paper, results of the research on the actual conditions of the bed variation based on detailed field survey in Kamanashi river are presented. The field survey is conducted for getting data of the bed form at two stages, just before and after a flood runoff, in the river.
Putting emphasis of consideration on the bars in the river bed, changes of bar geometry during the flood runoff are discussed. On the basis of existing theoretical and experimental study, migration distance and velocity of the bars during the runoff are tried to estimated. For quantitative evaluation of the bed variation characteristics, some effective methods to analyze various field data are also presented.
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